IRS Notice Guide
IRS CP521 Notice — What It Means and What To Do
Receiving an IRS CP521 notice can feel overwhelming. This guide explains what the notice means, what the deadlines are, and what options exist for penalty relief.
Response Deadline
Response deadline: Payment due by date on notice. Acting before this deadline preserves all relief options and prevents escalation to the next collection stage.
What This Notice Means
The IRS is reminding you of your upcoming installment agreement payment. The notice shows the amount due, the due date, and a summary of the remaining balance on your agreement.
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Common Penalties on This Notice
No new penalties — this is a payment reminder
Late payment penalty and interest continue on unpaid balance
What To Do After Receiving a CP521 Notice
Make the payment by the due date shown on the notice
Set up automatic payments (Direct Debit) to avoid missing future payments
If you cannot make a payment, contact the IRS before the due date to avoid default
Review the remaining balance and consider paying more to reduce interest
Keep the notice for your records
The IRS offers several penalty relief programs beyond First Time Abate. Upload your notice to see which ones apply to your situation.
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How It Works
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What you’ll see before you decide
A document-specific answer, not a generic promise:
- The amount at issue, itemized
- The rules or contract terms that appear applicable
- What looks strong, weak, or needs more evidence
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See which penalties may qualify and the amount at issue on your notice. The IRS makes the final decision.
Frequently Asked Questions
What happens if I miss an installment payment?
Missing a payment can result in default of the agreement. The IRS will send a CP523 notice of intent to default. If the agreement defaults, the full remaining balance becomes due and collection action may resume.
Can I change my monthly payment amount?
Yes. You can request a modification to your installment agreement through IRS.gov or by calling the IRS. Changes may include adjusting the payment amount, changing the due date, or switching to direct debit.
Does interest continue to accrue during an installment agreement?
Yes. Interest and the failure-to-pay penalty (at a reduced rate of 0.25% per month) continue to accrue on the unpaid balance throughout the agreement.
Have a CP521 notice? Check your penalty eligibility.
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Can I pay off the agreement early?
Yes. You can make additional payments or pay the remaining balance in full at any time. Early payoff saves on interest charges.
Will I still get a refund while on an installment agreement?
The IRS will typically offset (apply) any future refunds to the remaining balance on your installment agreement.
How long can an installment agreement last?
Installment agreements can last up to 72 months (6 years) for most taxpayers. Longer terms may be available for larger balances with financial hardship documentation.
See If You Qualify to Wipe Your IRS Penalty
Upload your CP521 notice and our tool checks the exact IRM provisions that apply to your penalty type.
Upload your IRS penalty notice · PDF, JPG, or PNG — a phone photo works
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See which penalties may qualify and the amount at issue on your notice. The IRS makes the final decision.